Interference alignment by motion

Adib, Fadel; Kumar, Swarun; Aryan, Omid; Gollakota, Shyamnath; Katabi, Dina

doi:10.1145/2500423.2500449

Cited by 34 publications

(13 citation statements)

References 27 publications

(41 reference statements)

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“…Fortunately, recent research using coil arrays provides positionfree solutions to the misalignment problem and it is found that charging efficiency increases from 4.8% to 64% [28]. Another option is to use mechanisms similar to "sliding antennas" [29] to fine tune and align the orientations of coils on demand.…”

Section: Discussionmentioning

confidence: 99%

Improve Charging Capability for Wireless Rechargeable Sensor Networks Using Resonant Repeaters

Yang

2015

2015 IEEE 35th International Conference on Distributed Computing Systems

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Wireless charging has provided a convenient alternative to renew sensors' energy in wireless sensor networks. Due to physical limitations, previous works have only considered recharging a single node at a time, which has limited efficiency and scalability. Recent advance on multi-hop wireless charging is gaining momentum to provide fundamental support to address this problem. However, existing single-node charging designs do not consider and cannot take advantage of such opportunities. In this paper, we propose a new framework to enable multi-hop wireless charging using resonant repeaters. First, we present a realistic model that accounts for detailed physical factors to calculate charging efficiencies. Second, to achieve balance between energy efficiency and data latency, we propose a hybrid data gathering strategy that combines static and mobile data gathering to overcome their respective drawbacks and provide theoretical analysis. Then we formulate multi-hop recharge schedule into a bi-objective NP-hard optimization problem. We propose a two-step approximation algorithm that first finds the minimum charging cost and then calculates the charging vehicles' moving costs with bounded approximation ratios. Finally, upon discovering more room to reduce the total system cost, we develop a post-optimization algorithm that iteratively adds more stopping locations for charging vehicles to further improve the results. Our extensive simulations show that the proposed algorithms can handle dynamic energy demands effectively, and can cover at least three times of nodes and reduce service interruption time by an order of magnitude compared to the single-node charging scheme.Index Terms-Wireless sensor networks, multi-hop wireless charging, resonant repeater, mobile energy replenishment, mobile data gathering, hybrid data gathering.

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Section: Discussionmentioning

confidence: 99%

Improve Charging Capability for Wireless Rechargeable Sensor Networks Using Resonant Repeaters

Yang

2015

2015 IEEE 35th International Conference on Distributed Computing Systems

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“…However, unlike BBN, they either require APs to exchange samples over the backbone [4], work only for the downlink traffic [26], assume presence of significant number of clients [19], require multiple antennas at transmitters or receivers [11], require the antennas to be physically moved [3] to a certain point, require the channel to change from one slot to another [7], precode over exponential number of time slots [7], or provide limited throughput gain [3], or do not scale with number of APs [11]. These assumptions are not practical in mobile networks since if the client is stationary, the channel may not change [27] from one packet to another.…”

Section: Related Workmentioning

confidence: 99%

BBN

Zhou

Bansal

Sinha

et al. 2014

Proceedings of the 20th Annual International Conference on Mobile Computing and Networking

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Today's Enterprise Wireless LANs are comprised of densely deployed access points. This paper proposes BBN, an interference nulling scheme that leverages the high density of access points to enable multiple mobile devices to transmit simultaneously to multiple access points (APs), all within a single collision domain. BBN also leverages the capability of the APs to communicate with each other on the wired backbone to migrate most of the decoding complexity to the APs, while keeping the design at the mobile clients simple. Finally, we leverage the static nature of the access points to make BBN more practical in networks where the mobility of clients inhibit the use of traditional interference alignment schemes. We implement a prototype of BBN on USRP testbed showing its feasibility. The experiment results show that BBN provides a throughput gain of 1.48× over omniscient TDMA. Results from our trace-driven simulations show that BBN obtains a throughput of up to 5.6× over omniscient TDMA.

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“…In contrast, we create the opportunity by mobility and quantify the diversity with microbenchmarks. The work closest to this proposal is MoMiMo [6], where the receiver adjusts its antenna in centimeter scales to actively perform interference alignment. While MoMiMo is a specific scheme optimizing for a given user, this paper is a generalization to a broader architecture.…”

Section: Related Workmentioning

confidence: 99%

“…(2) Infrastructure mobility may not be viewed as a onesize-fit-all solution, rather as a spectrum of opportunities illustrated in Figure 1. The opportunities range from centimeter scale antenna mobility to exploit multipath opportunities [6], to feet scale tethered mobility to evade wireless shadows and interferences, to full scale macromobility that minimize distance to clients. Network designers can choose to operate at different points on this spectrum, depending on user's requirements, budget, applications, and psychological comfort.…”

mentioning

confidence: 99%

Infrastructure Mobility

Gowda

Roy

Choudhury

2014

Proceedings of the 13th ACM Workshop on Hot Topics in Networks

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Mobile computing has traditionally implied mobile clients connected to a static infrastructure. This paper breaks away from this point of view and envisions the possibility of injecting mobility into infrastructure. We envision a WiFi access point on wheels, that moves to optimize desired performance metrics. Movements need not necessarily be all around the floor of a home or office, neither do they have to operate on batteries, or connect wirelessly to the Internet. At homes, they could remain tethered to power and Ethernet outlets while moving in small areas (perhaps under the study table). In offices of the future, perhaps APs could move on tracks installed on top of false ceilings.This paper explores the viability of this vision and presents early measurements from various home/office environments. We find that complex multipath characteristics of indoor environments cause large fluctuations in link quality even when the antenna moves in the scale of few centimeters. Mobile APs can leverage this spatial variation by relocating to a location that is strong for its own clients and yet weak from its interferers. Experiment results show that such micro-mobility itself can offer up to 2x throughput gains. Additional opportunities may emerge, such as in energy savings, security, QoS, and even in applications such as indoor localization. While this paper explores a small fraction of the landscape of opportunities, the results have been far more promising than what we had anticipated originally.

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Interference alignment by motion

Cited by 34 publications

References 27 publications

Improve Charging Capability for Wireless Rechargeable Sensor Networks Using Resonant Repeaters

Improve Charging Capability for Wireless Rechargeable Sensor Networks Using Resonant Repeaters

BBN

Infrastructure Mobility

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